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Finding the Fourth Proportional to 20,988.95, 28,963.98 and 11,913.03

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Solution

The fourth proportional to 20,988.95, 28,963.98 and 11,913.03 is: 16,439.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.95 : 28,963.98 = 11,913.03 : x
  2. Step 2: Convert to fraction form
    20,988.95/28,963.98 = 11,913.03/x
  3. Step 3: Cross multiply
    20,988.95x = 28,963.98 × 11,913.03
  4. Step 4: Simplify right side
    20,988.95x = 345,048,762.66
  5. Step 5: Solve for x
    x = 345,048,762.66/20,988.95
  6. Step 6: Final answer
    x = 16,439.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.